Topwo博客-缓存ndk编译生成文件的方法

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缓存ndk编译生成文件的方法

发布时间：2021-11-25作者：Topwo来源：原创点击：326

ndkBuildHelper.gradle
```groovy
import java.security.MessageDigest;

println "开始配置${buildscript.sourceFile.getName()}"

// 计算文件md5
def calcFileMD5(File file) {
    MessageDigest digest = MessageDigest.getInstance("MD5");
    file.eachByte 4096, {bytes, size ->
        digest.update(bytes, 0, size);
    }
    return new BigInteger(1, digest.digest()).toString(16).padLeft(32, '0');
}

def curApplicationMkMd5 = calcFileMD5(new File("${projectDir}/jni/Application.mk"));

if(!file("${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/Application.mk").exists() || curApplicationMkMd5 != calcFileMD5(new File("${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/Application.mk"))){
    println "开始备份[${projectDir}/jni/Application.mk]到[${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/Application.mk]"
    copy {
        from "${projectDir}/jni/Application.mk"
        into "${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild"
    }
    println "备份Application.mk完成"
}

android {
    buildTypes {
        debug {
            externalNativeBuild {
                if (PROP_BUILD_TYPE == 'ndk-build') {
                    ndkBuild {
                        arguments "NDK_APPLICATION_MK=${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/Application.mk"
                        arguments "NDK_OUT=${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/debug/obj"
                    }
                }
            }
        }
        release {
            externalNativeBuild {
                if (PROP_BUILD_TYPE == 'ndk-build') {
                    ndkBuild {
                        arguments "NDK_APPLICATION_MK=${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/Application.mk"
                        arguments "NDK_OUT=${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/release/obj"
                    }
                }
            }
        }
    }
}

project.tasks.create("copyNdkBuildDebugObj").doLast {
    println "开始拷贝NDK_OUT指定的编译生成文件到[${projectDir}/build/intermediates/ndkBuild/debug/obj]"
    copy {
        from "${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/debug/obj"
        into "${projectDir}/build/intermediates/ndkBuild/debug/obj"
        include '**/*.so'
        include '**/*.a'
        include '**/*.o'
    }
    println "Debug编译生成文件拷贝完成"
}
project.tasks.create("copyNdkBuildReleaseObj").doLast {
    println "开始拷贝NDK_OUT指定的编译生成文件到[${projectDir}/build/intermediates/ndkBuild/release/obj]"
    copy {
        from "${buildscript.sourceFile.getParent()}/${curApplicationMkMd5}.ndkBuild/release/obj"
        into "${projectDir}/build/intermediates/ndkBuild/release/obj"
        include '**/*.so'
        include '**/*.a'
        include '**/*.o'
    }
    println "Release编译生成文件拷贝完成"
}

afterEvaluate {

// if(file("${rootDir}/app/jni/Application.mk").exists()){
    //     File oldMkFile = new File("${rootDir}/app/jni/Application.mk");
    //     oldMkFile.deleteDir();
    // }
    // projectDir.renameTo("${projectDir}/../${curApplicationMkMd5}");

// 1. 找到需要依赖自己 Task的构建流程的Task
    def externalNativeBuildDebugTask = tasks.findByName("externalNativeBuildDebug")
    if(externalNativeBuildDebugTask){
        println "externalNativeBuildDebugTask=$externalNativeBuildDebugTask"
        // 2. 通过 finalizedBy 方法，插入到指定Task之后
        externalNativeBuildDebugTask.finalizedBy(copyNdkBuildDebugObj)
        // 3. 通过 dependsOn 方法，插入到指定Task之之前
        // externalNativeBuildDebugTask.dependsOn(taskName)
    }

// 1. 找到需要依赖自己 Task的构建流程的Task
    def externalNativeBuildReleaseTask = tasks.findByName("externalNativeBuildRelease")
    if(externalNativeBuildReleaseTask){
        println "externalNativeBuildReleaseTask=$externalNativeBuildReleaseTask"
        // 2. 通过 finalizedBy 方法，插入到指定Task之后
        externalNativeBuildReleaseTask.finalizedBy(copyNdkBuildReleaseObj)
        // 3. 通过 dependsOn 方法，插入到指定Task之之前
        // externalNativeBuildDebugTask.dependsOn(taskName)
    }
}

println "${buildscript.sourceFile.getName()}配置完成"
```
在项目的build.gradle引用
```groovy
apply from: file('../../ndkbuildout/ndkBuildHelper.gradle')
```

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